Whether the machining process specification of linear optical axis or precision axis parts for precision parts processing is reasonable or not directly affects the quality, labor productivity and economic benefits of the workpiece. A part can be manufactured by several different processing methods, but under certain conditions, only one method is more reasonable. Therefore, when formulating process regulations, it is necessary to proceed from the actual situation, according to equipment conditions, production types and other specific conditions, try to use advanced processing methods to formulate reasonable process regulations.
The machining of linear optical axis parts is the most basic and most important project for students to practice turning skills, but the quality of the final finished workpiece is always unsatisfactory. After analysis, the main reason is that the students have not formulated enough process regulations for the process analysis of linear optical axis parts. Reasonable.
1. In the process analysis of the parts diagram, it is necessary to understand the technical requirements of the part structure, accuracy, material, heat treatment, etc., and to study the product assembly drawing, component assembly drawing and acceptance criteria.
2. The processing route of carburized parts is generally: blanking → forging → normalizing → roughing → semi-finishing → carburizing → decarburization (for parts that do not need to increase the hardness) → quenching → threading, drilling or milling Grooving→rough grinding→low temperature aging→semi-finishing→low temperature aging→finishing.
3. Selection of precision benchmarks: The processing of precision parts should comply with the principle of coincidence of benchmarks, and design benchmarks or assembly benchmarks should be selected as positioning benchmarks as much as possible. In line with the principle of unification of benchmarks. Use the same positioning datum for as many operations as possible. Make the positioning datum coincide with the measurement datum as much as possible. Select the surface with high precision, stable and reliable installation as the precision benchmark.
4. Selection of rough datum: There are non-machined surfaces processed by precision parts, and the non-machined surface should be selected as the rough datum. For casting shafts that need to be machined on all surfaces, the surface alignment is based on the minimum machining allowance. And choose a flat and smooth surface, let the gate open. Choose a firm and reliable surface as the rough reference, and at the same time, the rough reference cannot be reused.